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Application.StoreDB.UpdateProduct(product) Catch As System.Exception MessageBox.Show("Error contacting database.") End Try End Sub This example has one potential stumbling block. When you click the Update button, the focus changes to that button, and any uncommitted edit is applied to the Product object. However, if you set the Update button to be a default button (by setting IsDefault to True), there s another possibility. A user could make a change in one of the fields and hit Enter to trigger the update process without committing the last change. To avoid this possibility, you can explicitly force the focus to change before you execute any database code, like this: FocusManager.SetFocusedElement(Me, CType(sender, Button))

s Caution It is critical to note that any policy can be overridden, but it is a bad practice and should not be done. However, if you do override a policy to check in code, everyone will know about it and you will have to provide an explanation.

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Like any other application, the first step is to create the base application from a template using Visual Studio 2005. (For those of you doing this from a text editor, you will need to do a bit more typing.) This time the template to select is Windows Service, as shown in Figure 14-2. I gave the new project, created from the template, the name Simple. You will find that the template adds WinService to your service names automatically, so I felt it a bit redundant to add some derivative of Windows service to the project name. But obviously, you can call your projects anything you want to or change the names created by the template.

The Product binding example works so well because each Product object is essentially fixed it never changes (except if the user edits the text in one of the linked text boxes). For simple scenarios, where you re primarily interested in displaying content and letting the user edit it, this behavior is perfectly acceptable. However, it s not difficult to imagine a different situation, where the bound Product object might be modified elsewhere in your code. For example, imagine an Increase Price button that executes this line of code: product.UnitCost *= 1.1

Code Analysis Selecting the code analysis policy brings up the Code Analysis Policy Editor shown in Figure 3-33.

Figure 14-2. Selecting the Windows Service template Unlike most of the other projects created from a Visual Studio 2005 template, this one is not a fully functional application when compiled. You still need to add installers to the project for the Windows service to run. I ll cover installers later in the chapter. What you do get is the service application part of the Windows service. The template adds a number of files to the project, but really at this point only two are of interest. If you used Simple as your project name, then the two files will be called SimpleWinService.cpp and SimpleWinService.h.

s Note Although you could retrieve the Product object from the data context, this example assumes you re

also storing it as a member variable in your window class, which simplifies your code and requires less type casting.

SimpleWinService.cpp, shown in Listing 14-1, is the code automatically generated by the template. This code is basically used to start the registration process of the Windows service.

Figure 3-33. Code Analysis Policy Editor Code analysis is discussed in detail in 13. For now, you should understand that you can enforce conformance to a set of design standards. The standards that come with VSTS out of the box are the standards Microsoft uses in .NET Framework and Visual Studio. You can select all or just a subset of code analysis warnings to enforce.

When you run this code, you ll find that even though the Product object has been changed, the old value remains in the text box. That s because the text box has no way of knowing that you ve changed a value. You can use three approaches to solve this problem: You can make each property in the Product class a dependency property using the syntax you learned about in 6. (In this case, your class must derive from DependencyObject.) Although this approach gets WPF to do the work for you (which is nice), it makes the most sense in elements classes that have a visual appearance in a window. It s not the most natural approach for data classes like Product. You can raise an event for each property. In this case, the event must have the name PropertyNameChanged (for example, UnitCostChanged). It s up to you to fire the event when the property is changed.

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